outdoor pvc pipe and saddle tee question about maximum pressure

I have a 1-1/2 pvc supply pipe in a 1100 foot run from my well to my house. I need to tap into this near the middle section for irrigation supply to a planned orchard.

I am contemplating using a sch40 saddle tee. I've dug up the pipe (36 inches deep). Of course, there is no lateral flex in the line, so either it's a saddle tee or
I cut out a chunk and splice in a regular tee paired with a compression coupling.

Don't use a saddle tee. They are trouble waiting to happen. You also must install a back flow prevention device where you branch off and the connections would be made with unions. You should consult with an irrigation supply company for the bests BF device. These are supposed to be re-certified annually by a licensed inspector. Idaho may not enforce these regulations, but you sure don't want contaminated water drawn back into you domestic supply.

Saddles are often used on larger pipe sizes to make a connection, but are seldom used with smaller sizes. If you do use one be sure to use hose clamps on both ends plus primer and glue on the pipe and saddle. Put the saddle on BEFORE you make the hole in the pipe. I fact, with my tools, I would also install the valve, then I could drill the hole without turning off the water, then close the valve when I removed the drill.

Interesting. Will a well primed, glued, and CLAMPED saddle last? I like the part about drilling it with the valve installed! (Ball valve?) I'm sure you're using some kind of splash-shield and a cordless drill to prevent electrocution...